GOES-16 ABI观测和ERA5全天空模拟亮温揭示的热带对流水平特征尺度对比分析     

汪栩涛  邹晓蕾 《气象科学》2024,44(1):125-137

本研究通过将GOES-16 ABI观测亮温和ERA5再分析资料的全天空模拟亮温进行对比分析,发现观测亮温和模拟亮温对流低值区位置大体接近,也能够定性反映出对流从发展到减弱的日变化过程,但亮温低值区域的强度存在较大差异。即使把高分辨率ABI通道13观测亮温平均到ERA5分辨率(0.25°×0.25°),在热带对流区的低亮温强度仍然高于ERA5全天空模拟亮温。因此利用主成分分析(Principal Component Analysis,PCA)和离散傅里叶变换(Discrete Fourier Transform,DFT)对任意选择的两对流区域内的观测和模拟亮温进行了尺度分析和对比。在其中对流较强的区域内,当ABI观测亮温的主成分分量从1增加到9时,水平特征尺度从700 km逐渐减小到150 km。ERA5全天空模拟亮温从主成分1增加到4时,水平特征尺度从950 km减小到270 km空间尺度,但当主成分4增加到9时,特征尺度几乎不变。在对流较弱的另一区域也能够发现ERA5模拟亮温对对流水平特征尺度有明显高估。ERA5模拟亮温各主成分的相位和观测亮温存在2 h以内的误差。由于ERA5全天空...  相似文献   

Assessment of eco-environment vulnerability in the northeastern margin of the Qinghai-Tibetan Plateau,China     

Zhou Xiaolei  Yan Yuee  Wang Hui  Zhang Feng  Wu Liyu  Ren Jizhou 《Environmental Earth Sciences》2011,63(4):667-674

The northeastern margin of the Qinghai-Tibetan Plateau is typically a vulnerable eco-environment where an overload of alpine meadows and serious soil degeneration have led to vulnerability to natural disasters. Consequently, this vulnerable eco-environment does not allow for rapid socioeconomic development, resulting in weak potential for sustainable development. The northeastern margin of the Qinghai-Tibetan Plateau in China is used for this case study, which sets up 17 impact factors of eco-environment vulnerability (EEV) to assess the indexes, including natural impact factors, economic impact factors and social impact factors. Subsequently, the study uses an analytic hierarchy process to endow index weights and proposes an assessment model of ^n P_i W_i /( _i = 1^n P_i W_i + _i = 1^n P_i W_i ) G = 1 - \sum\nolimits_{i = 1}^{n} {{{P_{i} \cdot W_{i} } /{( {\max \sum\nolimits_{i = 1}^{n} {P_{i} \cdot W_{i} } + \min \sum\nolimits_{i = 1}^{n} {P_{i} \cdot W_{i} } } )}}} to analyze and assess the dynamic changes in the EEV of the study area from 1987–2008. Finally, the correlation of the EEV and 17 impact factors is analyzed.  相似文献   

一个锢囚状中尺度对流系统的多尺度结构分析   总被引：1，自引：0，他引：1  

易笑园  李泽椿  姚学祥  王红艳  孙晓磊 《气象学报》2011,69(2):249-262

利用多普勒雷达、气象卫星、自动气象站等监测资料、1°×1°NCEP再分析资料和4DVAR雷达反演低层风场资料,运用雷达拼图图形叠加、剖面和中尺度滤波等分析手段,对2007年7月18日华北东部一个锢囚状a中尺度对流系统(MaCS)的多尺度空间、动力结构及其演变进行了细致地分析.结果表明:(1) MaCS生命史分为发生发展...  相似文献   

Distribution of intact and core GDGTs in marine sediments   总被引：1，自引：0，他引：1  

Xiaolei LiuJulius Sebastian Lipp  Kai-Uwe Hinrichs 《Organic Geochemistry》2011,42(4):368-375

We conducted a survey of archaeal GDGT (glycerol dibiphytanyl glycerol tetraether) distributions in marine sediments deposited in a range of depositional settings. The focus was comparison of two pools presumed to have distinct geobiological significance, i.e. intact polar GDGTs (IP GDGTs) and core GDGTs (C GDGTs). The former pool has been suggested to be related to living communities of benthic archaea in marine sediments, while the latter is commonly interpreted to consist of molecular fossils from past planktonic archaeal communities that inhabited the surface ocean. Understanding the link between these two pools is important for assessment of the validity of current molecular proxies for sedimentary archaeal biomass and past sea surface temperatures. The relative distributions of GDGTs in the two pools in a core at a CH₄ rich site in the Black Sea provide evidence for in situ production of glycosidic IP GDGTs and their subsequent degradation to corresponding C GDGTs on timescales that are short in geological terms. In addition, we monitored the relationship between the IP GDGT and C GDGT pools in a sample set from various ocean basins with subseafloor depth from a few cm to 320 m and 0 to 4 Myr in age. Notable differences between the two pools can be summarized as follows: the GDGT with acyclic biphytanes, GDGT-0, and its analogues with two and three cyclopentane moieties (GDGT-2 and -3) are generally more abundant in the pool of IP GDGTs, while crenarchaeol tends to be more abundant in the C GDGT pool. Consequently, the ring index is generally higher for the C GDGTs while TEX₈₆, a molecular proxy ratio not considering the two major GDGTs, tends to be higher in the IP GDGT pool. These differences in the proportion of individual GDGTs in the two pools are probably due to in situ production of IP GDGTs with distributions differing from those of C GDGTs. Despite these differences, we observed significant correlation of these two ratios between the two pools. Specifically, in both pools TEX₈₆ is high in sediments from warm oceanic regimes and low in cold regimes. We discuss these relationships and suggest that recycling of core GDGTs by benthic archaea is an important mechanism linking both molecular pools.  相似文献   

Low-Temperature Affected LC-PUFA Conversion and Associated Gene Transcript Level in Nannochloropsis oculata CS-179     

MA Xiaolei  ZHANG Lin  ZHU Baohua  PAN Kehou  LI Si  YANG Guanpin 《青岛海洋大学学报(英文版)》2011,(3):270-274

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Cloning and characterization of a delta-6 desaturase encoding gene from Nannochloropsis oculata     

马晓磊  俞建中  朱葆华  潘克厚  潘瑾  杨官品 《中国海洋湖沼学报》2011,29(2):290-296

A gene(NANOC-D6D) encoding a desaturase that removes two hydrogen atoms from fatty acids at delta 6 position was isolated from a cDNA library of Nannochloropsis oculata(Droop) D.J.Hibberd(Eustigmatophyceae).The unicellular marine microalga N.oculata synthesizes rich long chain polyunsaturated fatty acids(LCPUFAs),including eicosapentaenoic acid(20:5n-3,EPA).The deduced protein contains 474 amino acids that fold into 4 trans-membrane domains.The neighbor-joining phylogenetic tree indicates that NANOC-D6D is ...  相似文献   

Impacts of AMSU-A inter-sensor calibration and diurnal correction on satellite-derived linear and nonlinear decadal climate trends of atmospheric temperature     

Xia  Xinlu  Zou  Xiaolei 《Climate Dynamics》2020,54(3):1245-1265

Climate Dynamics - Satellite microwave temperature sounding data have been widely used in the study of climate trends over the past decades. When merging advanced microwave sounding unit-A (AMSU-A)...  相似文献   

新疆县域经济空间格局演化特征   总被引：8，自引：1，他引：7  

王静  张小雷  杜宏茹 《地理科学进展》2011,30(4):470-478

通过ESDA空间分析,研究1985年以来新疆县域经济格局在空间上的变化及其特征.结果表明:1985年以来新疆县域经济发展水平表现出较弱的空间自相关性,但集聚作用总体不断增强.热点区的空间结构主要集中在以奎-克-乌为核心的圈形结构,2000年以后热点区显著增加,不断向北疆中部、东疆以及南疆东北部集聚;南疆西南部处于经济发...  相似文献   

中国典型地区人文-经济地理研究进展与展望   总被引：2，自引：1，他引：1  

陈雯  张平宇  张小雷  邓伟  杨兆萍  薛俊菲  杜宏茹  李雪梅  刘颖 《地理科学进展》2011,30(12):1538-1547

城市密集区、老工业基地、陆疆、山区是中国主要的地域类型,也是人文-经济地理学研究“人一地关系地域系统”形成规律、驱动力和作用机制、演化过程与空间格局的重要对象。伴随全球化、工业化、城市化、信息化的快速发展,不同地区的社会经济与自然系统之间的匹配和适应关系正发生着深刻而剧烈的变化,加强上述典型地区的研究既是人文一经济地理学科发展的内在要求,也是强化学科在国家和区域发展中的服务职能的必然要求。本文分析了中国城市密集区的空间格局及其演化,城市老工业区改造,边境城镇集聚扩散的动力机制,山区聚落空间、文化景观及其环境与山区资源环境承载力等方面的最新研究进展;总结了在国家重大地域空间规划和战略咨询中发挥的科技支撑作用以及在典型城市密集区可持续发展、老工业基地振兴、山区资源环境承载力等方面取得的重大研究成果和产生的社会影响。从学科建设和技术方法层面,提出未来要加强城市密集区发展的社会和生态效应,老工业基地振兴政策与绩效评价,陆疆地域系统演变机理和发展模式,应对气候变化的山区可持续生计选择、动力、机制等方面的研究。  相似文献   

Low-Temperature Affected LC-PUFA Conversion and Associated Gene Transcript Level in Nannochioropsis oculata CS-179     

MA Xiaolei  ZHANG Lin  ZHU Baohua  PAN Kehou  LI Si  YANG Guanpin 《中国海洋大学学报(英文版)》2011,10(3)

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